True or false: Some animals can carry Giardia lamblia without showing signs of illness.

The statement is true because Giardia lamblia is a protozoan parasite that can inhabit the intestines of various animals, including pets like dogs and cats, as well as wildlife such as beavers and deer. Many animals can be asymptomatic carriers of the parasite, meaning they can harbor Giardia without exhibiting any signs of illness. This asymptomatic carriage is particularly important in the context of zoonotic transmission, where humans can become infected through contact with contaminated water, surfaces, or feces from these animals. Recognizing that some animals can carry Giardia lamblia without showing symptoms is crucial for environmental health specialists and sanitarians when assessing risks associated with water sources and potential exposure venues.